Conceptual design framework: Environment and Natural Resources (ENR) directory. Integrated Enviromental Management for Sustainable Development.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিConceptual Design Framework: Environment and Natural Resources (ENR) Directory. Diliman, Quezon City: Integrated Enviromental Management for Sustainable Development.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিConceptual Design Framework: Environment and Natural Resources (ENR) Directory. Integrated Enviromental Management for Sustainable Development.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.